The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.<br>A:They are not subject to permanent magnetism; no check is necessary<br>B:Semiannually<br>C:Annually<br>D:Every five years

The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
A:They are not subject to permanent magnetism; no check is necessary
B:Semiannually
C:Annually
D:Every five years

出自：海船船员证

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